What is the primary purpose of reflective triangles in commercial vehicles?

Answer: B — To warn approaching drivers of a stopped vehicle

The primary purpose of reflective triangles in commercial vehicles is to warn approaching drivers of a stopped vehicle. When a commercial vehicle has to stop on the side of the road due to a breakdown, accident, or any other emergency situation, placing reflective triangles a certain distance behind the vehicle is crucial for safety. These triangles are designed to be highly visible, especially in low-light conditions or adverse weather, alerting oncoming drivers to the potential hazard. This helps to prevent further accidents by giving drivers adequate warning to slow down and navigate around the stopped vehicle safely. The other options do not align with the intended function of the reflective triangles, as their role is strictly for safety and warning rather than aesthetics, weight indication, or decoration.